Helicase unwinds and opens up the DNA double helix at the start of DNA replication.

a. Polymerization
b. Nucleotide excision repair
c. Mismatch repair
d. Mutation


d. Mutation

If mistakes made during DNA replication are not caught and repaired, they can lead to permanent changes called mutations that are passed on in subsequent DNA replication.

Biology & Microbiology

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All organ systems in a human embryo have formed by ____

a. day 5 b. week 2 c. week 8 d. week 15 e. the 8th month

Biology & Microbiology

The earliest photosynthetic autotrophs were probably:a

similar to the green and purple sulfur bacteria of today. b. first formed about 1 billion years ago. c. the first organisms to release oxygen. d. obligate aerobes. e. fermenting heterortrophs

Biology & Microbiology

Which of the following normally occurs regardless of whether or not oxygen (O2 ) is present?

A) glycolysis B) fermentation C) citric acid cycle D) oxidative phosphorylation (chemiosmosis)

Biology & Microbiology

Bicarbonate that neutralizes stomach acid is produced by the

A. small intestine. B. duodenum. C. liver. D. large intestine. E. pancreas.

Biology & Microbiology